Amy Schumer reveals what John Cena used instead of his actual penis in their x-rated sex scene

2015 rom-com Trainwreck featured a memorable sex scene between Amy Schumer and John Cena - and Schumer has revealed what stood in for the wrestler's penis.

Directed by the man behind The 40-Year-Old Virgin and Knocked Up, Judd Apatow, the film symbolised a huge changing of the tide in Cena's career as he transferred over from professional wrestling to acting (if there's much of a difference).

Schumer, who played boozy magazine writer Amy Townsend on screen, spoke to Gregg Hughes on Opie Radio about her co-star's prop phallus during their sex scene.

Asked if she saw Cena's penis for real, the actress replied: "I don't think I saw his penis, he was wearing like a little leotard thing.

"It was a closed set when we were doing the sex scene, but slowly people just started coming in - but it was not at all for me, it was totally to see him in action."

Amy Schumer spilled the beans on her sex scene with John Cena in Trainwreck (Universal Pictures)

Schumer's recollection from filming was that she walked past the movie's prop guy who was 'whittling' something down especially for Cena's character Steve, which turned out to be a wooden penis stand-in.

She then likened Cena to that of a 'refrigerator on top of me', before waxing lyrical about his comic capabilities.

"I was dying laughing all the time, just... they had to redo my makeup because I was cry-laughing, because he's so f**king funny," revealed the 43-year-old.

"He's a genius, most of his lines he just said [off the cuff]. He was speaking Chinese, it was so crazy. He was so funny."

During an interview on The Howard Stern Show, Cena himself discussed working on Trainwreck, which also starred Bill Hader, Tilda Swinton and basketball legend LeBron James.

Describing it as a 'Spandex sock', he said that Schumer and Apatow went above and beyond to make sure he felt comfortable shooting their characters' intimate sequence.

He explained that they initially cleared the room so that he didn't feel intimidated, however, Cena 'didn't care' about stripping off to begin with.

"That scene started with a camera operator, focus puller and a boom guy... by the end of the scene, they had catering set up in there, everybody was in there," he joked.

"But I think the more comfortable you can be with it, the more you lose yourself in the thing."

According to the former WWE megastar, inspiration for this hilarious sex scene originated directly from Schumer's personal life, as she once had 'sex with a guy who was way to athletic for her'.